Ratings and MPRIS fixes.
Created by: JasonLG1979
- Fixed setting ratings via command line.
- Fixed emmiting MPRIS ratings changes.
- Remember last non-NONE Shuffle state so that the MPRIS shuffle toggles between "None" and the last non-NONE lollypop shuffle state.
- MPRIS TrackId's are object paths not strings, must be unique, and must not start with "/org/mpris/MediaPlayer2/" unless you are refering to "NoTrack".